General "very hot":
* Bardzo gorąco (pronounced: bar-dzo go-ron-tso) - This is the most common and literal translation.
* Upalnie (pronounced: oo-pal-nyeh) - This is a more informal way to say "very hot" and implies a strong heat.
For describing the temperature:
* Bardzo wysoka temperatura (pronounced: bar-dzo vi-soh-ka tem-peh-ra-too-ra) - This translates to "very high temperature".
For describing something that is physically hot:
* Bardzo gorący/gorąca (pronounced: bar-dzo go-ron-tsi/go-ron-tsa) - This translates to "very hot" and is used for objects or things that are physically hot.
For describing food:
* Bardzo ostre (pronounced: bar-dzo os-treh) - This translates to "very spicy" and is used for food that is hot in terms of spiciness.
The best way to say "very hot" in Polish depends on the situation and what you are trying to communicate.